Added initial Melody Playback Ability

Now, controlled via MQTT a Playback of a melody can Start, Stop, Pause 
etc. 

Settings like speed, total duration, pauses etc can be set.

PlaybackControls.hpp

@@ -0,0 +1,84 @@
+#pragma once
+
+extern melody_attributes melody;
+
+bool timeToStop(unsigned long now);
+bool timeToPause(unsigned long now);
+bool timeToResume(unsigned long now);
+void durationTimer(void *param);
+
+// Timer task to control playback state
+void durationTimer(void *param) {
+
+  // Task Setup
+
+
+  // Task Loop
+  while (true) {
+
+    unsigned long now = millis();
+
+    if (timeToStop(now)) {
+        melody.stop();
+    } else if (timeToPause(now)) {
+        melody.pause();
+    } else if (timeToResume(now)) {
+        melody.unpause();
+    }
+
+    vTaskDelay(pdMS_TO_TICKS(1000)); // Check every 100ms
+    }
+}
+
+// Check if it's time to stop playback
+bool timeToStop(unsigned long now) {
+    if (melody.isPlaying) {
+        uint64_t stopTime = melody.startTime + melody.duration;
+        if (now >= stopTime) {
+            Serial.println("TIMER: Total Duration Reached");
+            return true;
+        }
+    }
+    return false;
+}
+
+// Check if it's time to pause playback
+bool timeToPause(unsigned long now) {
+    if (melody.isPlaying && melody.loop_duration > 0) {
+        uint64_t pauseTimeLimit = melody.loopStartTime + melody.loop_duration;
+        Serial.printf("PTL: %lu // NOW: ",pauseTimeLimit);
+        Serial.println(now);
+        if (now >= pauseTimeLimit && !melody.isPaused) {
+            Serial.println("TIMER: Segment Duration Reached");
+            melody.pauseTime = now;
+            return true;
+        }
+    }
+    return false;
+}
+
+// Check if it's time to resume playback
+bool timeToResume(unsigned long now) {
+    if (melody.isPaused) {
+        uint64_t resumeTime = melody.pauseTime + melody.interval;
+        if (now >= resumeTime) {
+            Serial.println("TIMER: Pause Duration Reached");
+            return true;
+        }
+    }
+    return false;
+}
+
+void handlePlaybackCommands(char * command){
+  Serial.print("INCOMING COMMAND: ");
+  Serial.println(command);
+  if (command[0] == '1') {
+    melody.play();
+    PublishMqtt("OK - PLAY");
+  } else if (command[0] == '0') {
+    melody.forceStop();
+    PublishMqtt("OK - STOP");
+  }
+
+
+}